55 lines
1.2 KiB
C++
55 lines
1.2 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/utils/port/thread.h"
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#include "td/utils/port/thread_local.h"
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#include "td/utils/int_types.h"
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#include <atomic>
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#include <array>
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namespace td {
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template <class T>
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class ThreadLocalStorage {
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public:
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T& get() {
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return thread_local_node().value;
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}
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template <class F>
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void for_each(F&& f) {
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int n = max_thread_id_.load();
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for (int i = 0; i < n; i++) {
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f(nodes_[i].value);
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}
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}
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template <class F>
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void for_each(F&& f) const {
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int n = max_thread_id_.load();
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for (int i = 0; i < n; i++) {
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f(nodes_[i].value);
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}
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}
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private:
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struct Node {
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T value{};
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char padding[128];
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};
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static constexpr int MAX_THREAD_ID = 128;
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std::atomic<int> max_thread_id_{MAX_THREAD_ID};
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std::array<Node, MAX_THREAD_ID> nodes_;
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Node& thread_local_node() {
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auto thread_id = get_thread_id();
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CHECK(0 <= thread_id && static_cast<size_t>(thread_id) < nodes_.size());
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return nodes_[thread_id];
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}
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};
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} // namespace td
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